Bosch 15168 Oxygen Sensor - Upstream

Bosch Wideband O2 Sensor for BMW Z4

Bosch 15168 is an actual OE wideband air-fuel oxygen sensor built for precise upstream mixture monitoring. It is a specific-fit, heated replacement for 2006-2008 BMW Z4 applications and uses a 5-wire harness with a 6-terminal blade connection for direct integration with the vehicle’s engine management system.

Key Features

• Wideband A/F oxygen sensor for continuous air-fuel ratio measurement
• Specific fit for 2006-2008 BMW Z4, upstream
• Heated design for faster sensor operation and stable readings
• 5-wire construction with included wiring harness
• Oblong male connector with blade terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Steel finish and metal housing for OE-style replacement use

Product Details

The Bosch Actual OE Oxygen Sensor line focuses on OE-level fit, signal accuracy, and durability. Bosch 15168 uses wideband sensor technology to provide the ECU with detailed air-fuel ratio data across the full lambda range, which is important for precise fuel control during idle, cruise, acceleration, and load changes. For BMW Z4 owners needing an upstream oxygen sensor replacement, this part number offers the correct configuration for the listed 2006-2008 applications. Bosch 15168 also cross-references 11787540167 for the same application.

What This Sensor Helps Address

• Check engine light related to upstream oxygen sensor performance
• Incorrect air-fuel ratio readings reported by the ECU
• Rough idle or inconsistent engine response tied to sensor feedback
• Reduced fuel economy caused by inaccurate mixture control
• Higher emissions from a worn or slow-responding sensor

Installation Notes

Fits 2006-2008 BMW Z4, upstream. Verify connector shape, thread size, and harness routing before installation. This is a threaded, specific-fit sensor with an included wiring harness, so match the original sensor location and connector style before replacement. Use proper oxygen sensor service tools to avoid damaging the hex or threads during removal and installation.

Quality Assurance

Bosch developed the first wideband air-fuel oxygen sensor and has decades of OE sensor engineering behind this design. Bosch 15168 reflects that OE-focused development with a wideband sensing element, optimized heater control, and robust ceramic construction for consistent operation in demanding engine conditions.